This is the default value for the loss-adjudication threshold. An it is a persistent option, so there isn't any reason to put it in the .trn file. But 0 should switch off any score-based adjudication in any WB version since Winboard_x.

Thanks for checking. I should have looked at the code myself. It was just so surprising. I had been struggling with tweaks to get LeelaZero working in test matches, so perhaps I set the resign threshold to something like 9999 instead of zero for that tourney. If it crops up again, I'll try to see if it is reproducible.Thanks,Brian